Can't Install Leopard on MacBook Pro

I've got 2 MacBookPros:
MBP 1:
Bought 2007
Model: MacBookPro 2.2
2.33 GHz
System: 10.4.11
MBP 2:
Bought 2008
Model: MacBookPro 3.1
2.4 GHz
System: 10.5.5
I want to install OS 10.5 on MBP1 using the installation disks that came with MBP2. However, it won't let me do it. It tells me something like "System 10.5 cannot be installed on this computer."
Any ideas what could be causing this?

Paul Seymour1 wrote:
I've got 2 MacBookPros:
MBP 1:
Bought 2007
Model: MacBookPro 2.2
2.33 GHz
System: 10.4.11
MBP 2:
Bought 2008
Model: MacBookPro 3.1
2.4 GHz
System: 10.5.5
I want to install OS 10.5 on MBP1 using the installation disks that came with MBP2. However, it won't let me do it. It tells me something like "System 10.5 cannot be installed on this computer."
Any ideas what could be causing this?
First, it violates your license with Apple.
Second, all disks are keyed to machines they ship with.
You need to buy a copy of Leopard 10.5.4 for the other machine.

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