Anyone know whats different with the SL2rom pcb compared to the SLrom pcb? 

what game/post pics?

iirc the chr pinout uses the usual nintendo prg pinout. if your chr is over 128K it'll take extra work to install.

Here you go:
https://wiki.nesdev.com/w/index.p...

As well as:
http://forums.nesdev.com/viewtopi...

Interessting thanks guys!

So for the chr its just solder down as is for a 27c010, and for the prg (also 27c010) i need to ground pin 24 and route pin 2 to the hole under pin 24?

the game is dracs night out, and the donor is a blaster master
 

Exactly. CHR uses standard JEDEC pinout and can be swapped out one to one.
For PRG lift pin 1,2,24,30,31

This is for 27c010:
Pin 1 is VPP and should be tied to GND imo.
Pin 2 is connected to hole 24 (A16)
Pin 24 is connected to GND
Pin 30 is NC
Pin 31 is P (should be connected according to datasheet). GND should be fine.
I had cases where when I left P floating the EPROM wouldn't work. So make sure you read the datasheet for it.

Thanks, it works perfect