INL MMC3 Boards "TLROM TSROM TKROM" and "TGROM OR TNROM"

Are these boards all the same but with just different sized flash and sram chips or do the two groups actually have different pinouts and traces? Thanks and best regards.

INL has used Nintendo's original PCB names: http://wiki.nesdev.com/w/index.php/TxROM

However, you will note that the only practical differences between all of the TxROM boards are:
* Do they have PRG RAM (TSROM)
* Do they battery back that PRG RAM (TKROM, TNROM)
* Do they have 4-screen mirroring (TRROM, TVROM)
* Do they support more complicated mirroring than just H/V (TLSROM, TKSROM)
* Do they support CHR-ROM and CHR-RAM simultaneously (TQROM)
* All boards without anything extra (TBROM, TEROM, TFROM, TGROM, TLROM)

TL;DR: Yes, INL's boards are all the same just with different sized flash, SRAM, and battery.

And also standard JEDEC pinout.

This is important if the question is being asked to determine whether you could transplant an original NES mask ROM into an INL board. You could, but it would likely involve a little bit of rewiring, bent-out pins, etc.

Technically, there's a few more questions:
* do they have CHR ROM (TLROM, TKROM) or CHR RAM (TGROM, TNROM)?
* do they have hardwired mirroring (TEROM, TFROM)