Looking at https://developers.google.com/android/images, there are four factory images, two labeled PD2A and two labeled PD3Q. The first two from March, the latter two from June. My other 3a XLs are running PD2A 190115.032 - is this the version I should download or should I download and flash another, perhaps the latest PD3Q 190705.003, version instead?
Of course. Always use latest unless told otherwise.