friend good answer three questions 1) what difference is there between ferrox standard 4.83 and ferrox cobraa 4.83?
2) each folder of ps1 has my saved reads the game with a click reads the save without creating memory card ...... in cobraa ps1 games do not have options to emulate something that was in standard ferrox as netemu, at Clicking sends me to the xmb the game enters but the save can't I do to find the options that were in standard ferrox? .....
3) I suppose that in standard ferrox if I copy an iso ps3 it would not read it as it happens to me with ps2
Thank you for answering, I plan to switch to Ferrox Cobraa 4.86 because there is no standard Ferrox 4.86, but it is a thought ... but I must know the Cobraa to know how it works and if it works or if I stay or continue in Ferrox Standard 4.83.
1) Well, the biggest difference is the cobra

Is hard to write a short description of how cobra works and how many things it does, but lets say... cobra is a process that is hooked to a low level of the PS3 boot chain, is triggered automatically when the PS3 boots, and it runs in paralell to the firmware
The main goal of cobra is to allow to run plugins (custom programs that are going to run in paralell to the firmware too, in the background, active at all times) and to apply patches and deal with the emulators
Additionally, cobra have 8 "slots" to run plugins, and some of them are reserved to run internal plugins named rawseciso (this gives ISO support) and/or netiso (this gives ISO support by network)
Cobra have lot more features, im just mentioning the ones related with game backups
2) I dont understand well, you mean PS2 game format/s ?... well this could be a bit confusing because cobra have a lot of features related with the PS2 emulator/s. In old firmwares (before sony invented the "PS2 classics" and netemu) the saves was stored in "PS2 virtual memory cards" (is just a file, his internal structure is exactly like a real PS2 memory card) and this files are located under your "home" path in dev_hdd0
And with the "PS2 classics" format you are installing 2 memory cards located inside the installation directory of your "PS2 classics" game (so they belongs to the game, not to the system)
The format and locations of that PS2 virtual memory cards are different but are not an special problem
Cobra patches the emulator to use the old format... so you only need to "mount" a plain ISO and the saves are going to use the old format
3) This depends of the backup manager you use. When the source code of cobra was released there was a guy named estwald that was the mantainer of iris backup manager, and he made a derivate of cobra named "mamba", and he integrated mamba inside iris with the goal of having all/most of cobra features running inside a backup manager
The biggest difference is mamba starts when you enter in the backlup manager (not when the PS3 boots, like cobra)
Irisman and managunz (both are derivates of iris) have mamba integrated, they supports PS3 ISO since the first day (with 100% compatibility with the PS3 game library). The PS2 support was added later at some point, but im not so sure how good it works because nowadays most people uses a CFW with cobra (when irisman and managunz boots they autodetects that there is a "cobra running" and disables the internal mamba)
As far i remember... some months ago there was something broken in the mamba inside irisman (and probably managunz too) related with the PS2 support... but not sure about it
Anyway... you can try it right now, there is no need to update your firmware to check this
You can install irisman or managunz (latest version available), copy a non-encrypted (standard) ISO inside dev_hdd0/PS2ISO and try to mount it... and they should take you back to XMB with the "virtual" disc icon visible in [XMB]>[Game] column
*do the test with one of the PS2 games reported as "playable" in this list (this is important, by now you should ignore the other games with problems, or that requires a config file)
https://www.psdevwiki.com/ps3/PS2_Classics_Emulator_Compatibility_List