I think the difference is due to the passenger side window being a part of a door into the living compartment.
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I encourage peeps to read the content at the following post which is comprised of annotated screen captures taken from the Ukrainiane video implicating the former administration and, I believe, exonerating the current administration. In fact, the Ukraine content seems to prove that Joe & Obama committed treason and tried to overthrow President Trump.
I only performed screen captures for the first 32 minutes (whole video is 1 hour and 10 minutes in length) but treason is on display as is Joe's infiinite stupidity.
I really should go back and find the capture wherein Slow-Joe mentions "the President" (i.e., Obama) to check out what Joe says about traitor's role is in this. There may be more on Obama in the second half.
VP Elect Pence plays a role in the first half of the video. Did you know (Nov 17, 2017) Biden had been meeting with Pence to bring him up to speed about Ukraine because no one else on Trump's transition team had any foreign policy experience? Mmm Hmmm. Wouldn't you think Pence could have mentioned that throughout the Ukraine impeachment scame? I know I do.
https://freerepublic.com/focus/bloggers/3919329/posts?page=70#70