As mentioned above, 70% is essentially clear glass.
From the looks of the open door photo, I would guess that is somewhere around 35% film applied to it but really hard to say from a photo.
The factory rear tint is around 18%-20%. Assuming no film has been added.
So if you want the front to match the rear you need to apply a 20% film. But as mentioned 35% on the front doors is legal in most states.
I'm not sure what state you are in but down here in FL they don't normally mess with you for window tint unless they are just looking for an excuse to pull you over and check you out.
If you are looking to have the tint redone on the truck I would highly recommend a Ceramic window film as they block a ton of heat as well as about 99% of the UV rays which are really ******* (hard-on) the interior parts. You can even have the entire windshield tinted with a 70% film and you won't even be able to tell it has been done.
I have 70% on the windshield of my Burb and 50% on the windshield of my Honda that I use for work. If/when I have the windshield replaced on the Burb it will be getting 50% next go around.
***EDIT 1***
I forgot about the word nazis around here censoring stupid words so I had to go back and edit my post.
***EDIT 2*** evidently nazis isn't censored... yet.