We already have the official confirmation of it being on the same universe. However, the technology isn't the same: there aren't any Reyvateils (Song Magic is used by people that have made a pact with a Genome, from what I've read) and they don't seem to be relying on Symphonic Power as their energy source. Additionally, the language is completely different and aside of possibly "hyu-me", I haven't seen any similarity to any of the Ar Ciel languages.
Was ki ra sonwe, en nha here sheen oz dauan
Was yea ra hymme, en rifaien lusye sos infel.
infel, nafa, sarr, lyuma... xE rre <-x a.u.k. ween sphaela,
en ieeya grandus sorr, eterne.
xaa mmy zeertci sss, yaa ffe tty ccc.