With some of the unique cuts at the living room, I think there may have been a bit more waste. Discussed disassembling and starting over with my husband and he vetoed that idea. So...I moved forward 😬
I ended up using superglue on the short lip holds like one piece and clicked the other long edge in place. I spoke with the flooring guy I purchased this from (they have a DIY type package and so will answer some questions along the way), and he felt with the transition piece in place, it shouldn't be a problem. Here's the current - original transition just laying on top as with the new height, it wouldn't snap in place (may need to add a thin board underneath the metal track or make a new one).
I just got that done this morning. Time will tell if that was the right choice. I looked back a some other rooms I did with laminate and there were some thinner pieces at doorways which have remained rock solid. Hopefully this will be the same.
Much thanks to everyone for the tips and suggestions. I appreciate my Craftisian community so much. Pretty sure this is the last flooring job I will do!!! For now...continuing on into the kitchen (ignore the little pieces of blue tape - those were to help me ensure I had all the joints randomly staggered...planned randomness 😁).