I'd say let the sativas go for a few more weeks. Just squeeze your new plants in.
I'd say the lanky plants are a pure sativa, and will probably go another six weeks.
I think it will be worth the wait.
Look up everything you can find about Low Stress Training, often referred to as LST. You can ger very agressive with the bending, as long as you go slowly. Bending can be done in stages, bending the branches a bit, daily until you've achieved the desired results.
In my garden, White Widow finishes by mid October, or about 9 weeks, and looks nothing like your plants.
I had a Neville's Haze go well into November, last fall, which would translate to about fourteen weeks of flowering, outdoors(greenhouse).
A couple pix of the Neville's at harvest.
Note the new growth and lankiness, at harvest.