Likely not. My brief digging into trying to find a definitive document on what is 'standard SQL' led me down a rabbit hole and I gave up on working out whether

Likely not. My brief digging into trying to find a definitive document on what is 'standard SQL' led me down a rabbit hole and I gave up on working out whether it was or wasn't. The likelihood of having to change to a different provider on any project that has settled on SqlServer in my experience is fairly close to 0. YMMV