I've only got Visio 2016 so I can confirm that both those stencils are in Visio Standard 2016. I'm pretty sure if you have the stencil already on an earlier version then you could copy it into the newer version of Visio and use it happily (assuming your new Visio version didn't have a more recent version)

I would presume that there must be a listing of 2019 stencils somewhere on the internet but it does seem inordinately hard to find.

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Andrew Lockton
Chrysalis Design, Melbourne Australia