MP dual valve springs

Thinking of trying the small block MP .557/296 solid cam, calls for the MP 3614542 dual springs. The retainer for these springs is MP 4452033 and is listed for single and dual MP springs. My question is, are they the same retainers used as the stock replacements? My X heads are already machined for dual springs so if I could reuse my retainers and locks it would be a drop in.