Venting two grow tents with one 6" Inline/Scrubber combo?

I purchased a 2x3 grow tent and despite my satisfaction with how it works, the space is just too small since the girls must share with tomatoes, basil, and other garbage. I have a 6" inline and scrubber combo with 6" insulated ducting. I'm considering purchasing another tent (4.5x4.5 for vegging) and light setup, however if I just run ducting between the two tents, wont the scrubber/inline in the 2x3 create negative pressure in the 4.5x4.5 and filter the smelly hot air just like in the 2x3 (effectively cooling/filtering both)?

Thoughts or suggestions?

How about a Y adapter connected to the inline, pulling air from both rooms (then I would just need a Y adapter and new scrubber)?

As long as the air suction in the smaller room can deal with the heat/air extraction from the bigger rooms light then yes, but why scrub twice though?