Good Day Tony,
ASTM A285 Gr C is a Pressure Vessel plate.
While its' tensiles fall within D1.1 scope, it is not included in the D1.1 Tables of Pre-Qualified materials so cannot be used unless submitted to all the Clause 4 tests to become Approved By Testing with a PQR.
Since it is not in that category, no other tests on other steels will do any good. You must get your procedure approved through Clause 4 testing.
IF it were in Table 3.1, then you would just have to make sure your WPS included it in the way it is prepared or re-write one to include it. BUT, it isn't there.
Thus, your direct question, it needs another/new PQR for its' use.
He Is In Control, Have a Great Day, Brent