Note: The ACEA adopted this API test and created a new category for it (A7/B7, C6). These categories also includes the TGDI chain wear test (Sequence X). Both Sequence IX and X are part of API SP. The Seq X test engine is also a modified Ford I4 ecoboost.
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Not that I'm aware of but formulators have updated their add-pack to API SP over the past year or so which means almost any oil sold with a Mercedes cert will also have API SP on the label. This makes the A7/B7 rather irrelevant.
One shouldn't assume API SP is "more stringent" either.