^The only problem that you would have is that your dad's computer won't boot.
All you should be concerned with is that they are CL3 at 400MHz and they require 2.6V. Provide the part numbers so that buyers can figure out what they are. The Infineon module is fine and so is the other module from CompUSA. If I could find that info, so can your buyers.
Hi, well like I see in the picture I can say this.
DDR-400MHz PC-3200 CL3 1.8V
Now, for the other, you can install it in your dad's computer without problems to see the timings.