Most likely, yes.
I went to a Regional Leadership Workshop one year for AST and another chapter had "Alpha Sigs" on their shirts. I was thinking "What the ???
" because at MY school, Alpha Sigs were Alpha Sigma Alpha (our rush rivals at the time), and we were the Alpha Taus. At their campus, they are the Alpha Sigs (I don't think they had ASA).
Also, at my campus, Phi Sigs were Phi Sigma Kappa.