Installation of Progressive Dynamics 4600 Charger

I am wondering if any real difference between the Inteli-Power 4600 upgrade and the PowerMax PM4B-45 (45 Amp 4-Stage Converter/Charger)

As was mentioned above, if you have the "split" 6300 fuse panel now, it has to be jumpered or replaced with a non-split anyway. So might as well use the proper PD one.

You will lose not only the charge wizard button as tpi said, but also the indicator light that tells you which mode your charger is in. Those may or may not be important to you.

There are instructions at bestconverter.com to show you how to modify a 9100 series pendent to provide those services, but it would seem easier to me, as well as cheaper since you don't have to buy a pendant, to just install the 12v board.

Also, on a related note: the new board only has a single 12v hot lug coming from the converter. Some of the old 12v boards had 2 of the hot lugs. If you keep the old board and it has two of the 12v hot lugs, you will have to jumper between them.

What functionality will I lose by not replacing the DC fuse board?

The charge wizard control. The push button you use to cycle through the various voltage settings is on the fuse board. As far as I know it will automatically do it's thing without the button, but I find the button very useful to jump to the voltage needed if necessary.

Use a cell phone and take pictures before you disassemble. This will give you a record of where to place the wires if you get confused. I do this and it works quite well.

it shows on u tube to place the wire on the new board as you remove it from the old board, thus not getting them mixed up

Some of the DC distribution panel has two 12 volt feeds. Depending on what you are replacing as to whether simply jumpering would take care of this.
I would suggest replacing as shown in manual. Mark each wire as you remove it from DC distribution panel.