Is top soil plus some peat the same as peat-based compost?

Its just that I'm building a terrarium and they say peat-based
compost, but all the stuff they sell has added bits of vermiculite or
other white stuff in it which doesn't look so nice. I bought a big bag
of top soil ($1.28) and a bag of sphagnum moss peat and was wondering
if that would make for a good terrarium when mixed.

Thanks!

-Dean