External hard drive for both a PPC and Intel Mac?

I have 2 LaCie Hard Drives (500GB & 750GB) that I'd like to use for backing up my 2 laptops and for storing photo and music files.
When I got the MacBook Pro, I partitioned the 500GB drive into 3 volumes and used SuperDuper! to make "bootable" copies of the MBP on one volume, theiBook on one volume, and put photo files on the third. I don't know/can't remember how I dealt with the directions below from Disk Utility and I fear I may have done the impossible or at least done the wrong thing.
"If you will use a volume as a Mac OS X startup disk, click Options and choose the appropriate partition scheme. To use a volume to start up an Intel-based Mac, choose the GUID partition scheme. To use a volume to start up a PowerPC-based Mac, choose the Apple partition scheme."
As I ask these questions, I find myself getting tongue-tied so please bear with me and read on...
#1 - Is it *even possible* to do what I want and have the bootable copies of both of these laptops on the same HD since one is PPC and the other Intel? If the answer if yes, it's OK then the rest of this is moot.
#2 - I can easily delete one or the other laptop backup from the 500 LaCie and put it on the virgin 750 and partiton it - problem is, is there a way to know how I partitioned the 500 HD so I won't have to redo it -I don't want to have to recopy the thousands of photo files already on the HD. If I knew how it was partitioned - Intel or PPC - I could just delete the appropriate laptop and move it to the other LaCie, assuming I have to.
#3 - And, is it possible to use a drive that has been partitioned for PPC or Intel with the other type computer - will I be able to access the jpg photo files from both the MBP and my G4 both of which are Tiger no matter which way the HD is partitioned? Now I as able to do this, but as I said, I don't remember which way I partitioned the HD - all I remember is that I did choose to include OS 9 drivers since I still use Classic and OS 9 on the G4. ( I have yet another LaCie that I use exclusively to back up my G4 and it is not part of this issue)
Mrs H

So "To use a volume to start up a PowerPC-based Mac, choose the Apple partition scheme." really means it will work for my Intel MBP too?
Yes.
Is there a way to tell if that is what I already choose?
Select the existing drive in the Disk Utility and find the Partition Map Scheme text at the bottom of the window.
(34529)

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