Reading the.online application data sheet for both to see the differences. It's a simple one page document. Probably different formulations.
No such thing as one coat coverage. Can lash on heavy with thick pile roller though like in rental bashing. Is that what you mean?
With silk it's sometimes better to apply a matt first.
Depends what you are trying to cover.
Most surfaces need two coats. If it's grubby or dark colour you will need three coats.
Buy the cheaper one imo
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