New To PSP Modding, Few Questions About 3.71 M33-4

Hey, as the title states I'm new to the PSP modding scene and i just want to find out a few things to do with the 3.71 M33-4 CFW.

I recently bought a PSP Slim that had already been updated to 3.71 M33-4 CFW, and now Ive got a mate that wants to get a PSP that can also play games from the memory sticks. If I use a Pandora battery to install 3.71 M33-2 onto a new PSP Slim and then update to M33-4 will it be the same as the one I have already, as in will it play games directly from the memory stick? Or will I have to do something else as well, something to do with that Popsloader?
Am I right in thinking that all I have to do is to get M33-4 installed and running on a PSP and ill be set? If not if anyone can point me in the right direction, that would be helpful.

I've been reading a bit about the Pandora Battery's but at this point in time I'm not really confident enough to make one myself so ill most likely end up buying one off one of the scabs on ebay, plus the fact I don't have a spare battery that can be used as a Pandora battery.

I'm pretty sure all of the files I have so far to do with CFW I've got from http://dark-alex.org so I assume they are all good copies that haven't been messed with or corrupted, so I hopefully wont have any problems with corrupted files.

On a side note, it looks like 3.80 M33 has been released on http://dark-alex.org.

Sorry if its a bit hard to understand, I'm a bit tired.

Thanks