Swapping sound boards from one Legacy diesel to another?

Should not be a problem. The pinouts are the same. Pretty sure you could also use a current ERR Railsounds board as well if horn and prime mover sounds are most important to you. ERR has a volume pot onboard while the Railsounds Lite board has a connector for a remote pot but thats the main difference.

Pete

Well, the ERR board will only work with TMCC, it won't work with Legacy.  However, the swap that Don is considering shouldn't be an issue, just a one-for-one swap of the boards.

I have to add that since one of these engines is a 2-stroke and the other is a 4-stroke, they certainly won't be prototypically accurate as far as the prime mover sounds are concerned.

Thank you Pete and John for the responses.  

I took the respective boards out of there plastic holder and checked the Lionel part number.  On the PRR U28c, the part number is:  691 RSL1 B00 REV 1 and on the Southern GP30, the part number is 691 RSL3 A00 REV 2.  Do these have different numbers because of the sound chip used on each one or are there other difference that would not allow them to be interchangeable?

Although the pinouts appear to be the same, the Southern has a lot more wire plugged into it.

I would once again appreciate your thoughts.

Thanks,

Don

PS;  I am one of those who prefer sounds that I like over prototypical accuracy.  I really have not been around enough trains to know the engine sounds of each type.

Only Lionel knows for sure what changed between Rev. 1 and Rev. 2 of the RS-Lite boards.  However, I can say with about 99.98% certainty that swapping them won't damage them.  You may not get the exact results you seek, but you can always swap them back.  I've swapped various versions of RS-Lite boards around without any issues.

The "sound chip" is actually a FLASH memory, the RS-Lite boards are factory programmed to the application, so all the boards from a specific run are identical hardware wise.  The only issue I see is the possibility the serial data commands for sound have been altered in the intervening two years, but I tend to doubt that.  They guy that could certainly say for sure what the risks are would be Jon Z. @SantaFeFan, he's the authority on these having been the designer of both ends.

Update!  I swapped the boards out and both engines are doing fine.  For the first time, I am enjoying running my Southern GP30.

Thanks for the help.

Happy railroading,

Don

Thanks for the update, glad it was an easy fix.