OC is not a " type ", but a nomenclature. As BC or AC or AY or BY or BF....
In the same kind of neve module you could find different original substitutes in the same place of the schematic. For example,in my B100 card there´s a mullard oc44 in place of the AC107 and a Texas Instruments TIXa02534 in place of the NKT216. n my 2252 compressor, the B100 has 2 texas i. 2g309b10, and 2 b104´s drive a couple of OC22´s....