The answers you were given in the HP forums for this question are about right.
I would suggest that you get an official answer from HP support.
HP can not give a clear answer. I'll ask for something else so as not to affect the rights. I will ask about your products. Processors e1-6015 and a8-7410 are interchangeable? I mean, what is their socket and chipset on which they normally work the same? Also RAM ddr3l?
Sorry for my English) I'm not very strong in it. If you do not understand something, tell me. I will try to formulate my question differently.