Somehow they all feel about the same width on the inside.
I haven't sat in a supercab ranger in 15 years so can't really comment on room that way.
Supwecrew isn't long enough for me and car seats.
The new Ranger is definitely more roomy inside compared to the 2011 Super Cab. The 2011 is more aircraft cockpit/cocoon like. It can feel confining at times. The 2019 feels more roomy even if the actual dimensional room isn't that much different. I think it is but I don't have numbers to prove it one way or another.
The center console in the 2019 is a bit confining compared to my 2011, which doesn't have one but the arm rest is less intrusive in the 2019 compared to the 2011. The interior encroaches in some ways and gives in others in both.
The windshield is bigger and allows more outward visibility in the 2019 compared to the 2011 but the side and rear windows are smaller and more visibility limiting in the 2019 compared to the 2011. So, things like that can appear to make an interior more open or confining as well even if they really aren't. The seat height and interior roof clearance is different as well. I think the seat is higher as well as the roof in the 2019. Also, the windshield in the 2019 has a steeper rake compared to the 2011. So, the 2019 could seem more confining because of A pillar position but the dash is more expansive as a result as well.
It really comes to personal perception. I think the 2019 cab is dimensionally larger than the 2011 but execution of the layout may make it appear to not be that way. I'm only basing that on the front seats since there really isn't a way to get an apples to apples comparison for the rear seats between the Supercrew and the Supercab of my two trucks.
I do know the new Rangers have more room in the Supercab compared to the Supercab in the older models. Looking at Johnny O's truck compared to mine, the rear might be tolerable for someone other than a 10 year old or younger like it is in the 2011. I wouldn't put a teenager or an adult in the back of the 2011 unless it was a real short trip somewhere. It serves as extra equipment storage better than extra passenger room.