Dell Clamshell desktop hard drive question

Is it possible to inexpensively replace a APL Maxtor DiamondMax 16 80GB ATA/133 HDD
with a ID Maxtor DiamondMax 10 Model ;6L 100P0 100 GB PATA133 HDD ??
1st one is from a Dell desktop. 2nd one is from a homemade tower,both are XP Pro OS's. TIA
 
I have not "forced" any connection, but I have connected the 2nd harddrive mentioned to the connectors & so far it went well.
No,I have not turned it on or booted it up & won't if it could/would/might damage anything which is why I'm asking before proceeding. Any thoughts? TIA:)
 
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