The 500a Mag is an Android, as is the 410 model.
The 410 is equipped with the Android OS 6.0.1 version, while the 500a model is equipped with the Android OS 9.0 version.
Being an Android, they both will allow 3rd party Apps to be installed.
So I think the question you may be looking for answers to --> 'is the stbu pro app compatible with the 9.0 version'.... Which I do not know the answer
They both have the Widevine L1 installed , which is good.
The Hardware with both is similar, both use same Chipsets and Processors , or close to it, although this has nothing to do with the abilities to run certain apps.
The 500a does also come with Ministra Middleware Platform (besides the Android OS), as also does the 410
And ... Papiao now supports this Ministra Platform, so it looks like you can use it thru the Middleware or thru an Android app (such as the stbEmu Pro).
Important to note is that the 500a looks like it is a Android'TV' model, as I see that it does carry the Trademark.
Android'TV' is owned by Google and is their trademark and is why I have purposely mis-spelled it here.
Depending how you feel about Google, you could choose to use that resource at a cost (financial and personal) or ignore it.
Turn off any tracking or surveillance options that it may have as user options