Those two box you posted in the photo the K.O tabs are not removeable but just push the cable in I Know it will be hard at first but once the cable in the place it is not a issue.
even single gang old work box have same pattern as you show the photo the new work box do not have that type of hold in clip like that just punch it out.
Just beaware two things .,
• wire capicity fill. just don't overfull the box
• old work round box if you mount them on wall or ceiling they are limited to about 3 KG or 6 pounds anything hevier than that get a old work ceiling fan box they will have expandable spanner to lock to the studs otherwise a pancake box will work if you hit the stud.