Conversion systems 7 and XP

[duf]

Hi,
I have installed two systems on two different drives. System 7 installed in order to test and I went to the old IDE drive. I have XP installed on a larger disk drives. I wander how interchange systems. Ask for suggestions and I will describe own idea because I do not know how well combines.
I'll backup the receipt of each system and put it on the third USB-attached disk and then run Paragon CD (WinPE) and I'll copy a disc of 7 on the drive system with XP with losing XP. Copy disk with system 7 and in its place will do recovery of XP. Is this how it should look like?