Here's a few indications they are the same person, just one is more sweaty and has a tan (right).

In the throat there is a dip in the wrinkle leaning toward his right side. From it, you can see a trail leading up and to his left where it undercuts his throat grizzle and also to the bottom to his left and tucks into the collar. These wrinkles would be nigh impossible to replicate in surgery.

The ears check out too. Same pitch and angle.

I can't comment on facial features, because he is giving a different expression in each. The jaw is in a different location, as well, so it makes using measurements of the head difficult.

Eyes are the same color, and have the same starburst pattern.

The hair is longer on the right, but the graying pattern is the same.

Density of his left eyebrow lines up too, with a thin strip being notably darker and having a double-hump like a sketched seagull.

Finally, the fold of his left eye has a crease extending into the radix.

My conclusion? Same Pompeo with a tan or a really good deepfake that also does necks.