2009 MFD substitutions

I have an intermittently failing 4 button Multi-Function Display on my Prius 2009 - with 9 speaker/Bluetooth option part (86110 47210).

Some posts on this forum and some sellers on eBay indicate that the 86110 47230 part may be substituted if you don't care about Bluetooth.

1. Is this safe? Can damage occur to the boards?
2. Will the stereo still work?

If not, is the power supply board on the 47230 part swappable with the power supply board on the 47210 part? I think the caps are failing.

 

Here is a similar thread that I looked at.

MFD compatibility | PriusChat

It does not address my question about the 6 vs 9 speaker difference. The 47210 part is for 9 speakers (JVC) and the 47230 is for 6 speakers apparently, so I am concerned that the radio would no longer be controllable. Any thoughts?

 

Me again. Success!
I have substituted the
MFD 86110 47210 (9 speaker, Bluetooth) part with
MFD 86110 47230 (6 speaker, not Bluetooth)
and everything works fine (without BT obviously).
The stereo (JBL under passenger seat) is controllable the same way, I guess the signalling is compatible.

Just confirming in case anyone else needs to do this.
I may re-attach my old Bluetooth board later.