Hacking an HP 6626A into a 6629A, by swapping output boards

[SharpEars]

The question is, would this work? It has two low power boards (25W) and two high power boards (50W). What if I were to pop out the low power boards and replace them with high power boards. Would the device function properly (i.e., is the logic of what an output is capable of in the output itself, or "higher up")?

You can see the datasheet describing the two supplies at:

6620A Series Precision Multiple-Output, 25-50 W DC Power Supplies, GPIB

It seems like a lot of parts between the two supplies are the same, so I am wondering if just switching output boards will do the job.

[Le_Bassiste]

perhaps  you just swap the internal RJ-45 connections of a low- and high-power board and then check whether you still have full control over these. 
if not, or if the selftest on startup (if enabled, that is) throws an error, you probably need to modify the ROM contents on the GPIB card.
tbh though ,i doubt that the GPIB will throw an error, simply because all 4 control processors on the power boards share the same partnumbers.