theirs one i was thinking about getting but i wasnt sure if they were the same  

It really depends on what you mean by "fitting" and which parts of the interior you're speaking of.

The seats and door panels will physically fit, but the pattern on the vinyl will be different. The dash pad will bolt in as well but the 70 pad is thicker and looks different than the 68

The steering column is a different story, in 70 the key switch is on the column, in 68 it's not.

So yes, some of the stuff will bolt in, but might not look 100 percent correct.  

all i really need out of it are the seats and guages, i was just wondering if they would work  

The seats will bolt in. If the guages are the round guages, (which they should be for the '70) you'll have to change the dash frame from the 70 into the 68. It's a good deal of work, but not especially difficult. If the wiring is different, since the key on a '70 is in the column, you'll need to get a wiring harness from a '68 or 69 Dodge (Super Bee, Charger, RT). The dash frame from those cars will work as well