As there is no reports on that you must guess. I don't think it matters if you present documents in neat form. There is plenty of argument why to use multiple accounts whereas living abroad or in general.
I was asked at 2nd land border what I do here as it's my another enterence. Though not much more beside it. Officer went through my passport and I got exemption stamp.
I can't find details about this bus, but there should be one: "Amm Co. Bus is 350 Baht to Siem Reap from the border and runs early in the morning and at 4:30 PM."
so it also should go back. Going by taxi makes no sense, it would be cheaper for me to fly by any route