Thomas I don't see a problem in the specs are the same. That said sometimes computers are picky about ram, Since you already have the ValueRam stick I would try it and see if it gives you any problems. Good luck.
I have used (and often prefer) ValueRam from Kingston. In the "old days" I would never bought any other RAM than Kingston. Seems though that newer Macs are happy with all kinds of brands. Or they make RAM more compatible I guess.
Now in use in my old Mac Book Pro 17" Santa Rosa 1229,in combination with my old 2 GB chip,works fine,and my computer now is a lot more happy for the Lion upgrade,4 days delivery to Europe,I'm impressed,happy costumer here.