Fantastic Four #169 (Pt 4) Ben Grimm and Dr. Santini

1967: Fantastic Four #68  Jack Kirby

1976: Fantastic Four #169  Rich Buckler

Below, the subsequent panels in the respective sequences.  Dr. Santini and Ben must shop at the same store :)

Fantastic Four #68

Fantastic Four #169

Giant-Size Super-Stars #1 (Pt 37) Coffee Talk

        1967: Fantastic Four 68 Kirby                    1974: Giant-Size Super-Stars 1  Buckler

Giant-Size Super-Stars #1 (Pt 13) Ben Gets Bombarded

         Fantastic Four #68 (1967)                     Giant-Size Super-Stars #1 (1974)
             by birthday boy Jack Kirby, natch!                                    Rich Buckler                                                                                                                    

Fantastic Four #124 - Night Nurse

This is my favorite so far. 

FF#68 (1967) Jack Kirby

FF #124 (1972) John Buscema

Fantastic Four #151 (Pt 9) Thundra and Lightning--and Crystal

Fantastic Four #151 (1974) Rich Buckler

Fantastic Four #68 (1967) Jack Kirby

Yeah, these look similar mostly due to the Sinnott-inked faces. But there's also the matter of the elongated arms. What do you think? 

Fantastic Four #151 (Pt 4) Ben Is Bustin' Out All Over

Fantastic Four #151 (1974) Rich Buckler

Fantastic Four #68 (1967) Jack Kirby

Back in 1974, Marvel's Greatest Comics #51, which reprinted FF #68,  was on sale at the same time as Fantastic Four #150--so, about a month prior to FF #151 hitting the stands. I wonder, did readers of both mags connect the dots and notice the source panel?

At any rate, fans seemed to have really enjoyed the art on this mid-70s FF run. The Buckler-Sinnott Kirbyesque art was often lauded in the FF letter columns; and as one letter writer put it in Fantastic Four #164: "It's Rich Buckler's tribute to the style and excellence of the F.F. in their former day of greatness." 

Fantastic Four #151 (Pt 3) Ben and Johnny, Two For the Road

This one's a combo. The trench-coated Ben seems to be adapted from FF #68, while Johnny is from #44.

                                            Ben

Fantastic Four #151 (1974) Rich Buckler

Fantastic Four #68 (1967) Kirby

Johnny

Fantastic Four #151 (1974) Rich Buckler

Fantastic Four #44 (1965) Kirby

Plus, because FF #68 is used above, I feel it's the inspiration for this panel too. 

Fantastic Four #151

Fantastic Four #68

Fantastic Four #151 (Pt 2) The Salesman

The salesman in FF #151 reminded me of the (fake) Dr. Santini in #68.

FF # 151 (1974) Buckler

Fantastic Four #68 (1967) Kirby

Giant-Size Super-Stars #1 Part 1

Sure, it's a given that a lot of scenes in GSSS #1 were inspired by Fantastic Four #25-6 (another Hulk-Thing slugfest)...so what say we take the less traveled road here. For example, here are a couple of panels from 1974's Giant-Size Super-Stars #1 that looked to 1967's Fantastic Four #68 for inspiration.

Giant-Size Super-Stars #1 (1974) Rich Buckler

Fantastic Four #68 (1967) Jack Kirby

Giant-Size Super-Stars #1 (1974) Buckler

Fantastic Four #68 (1967) Kirby

The above is a standard Kirby pose; for instance, Jack also used it just an issue earlier, in Fantastic Four #67

Fantastic Four #67 (1967) Kirby
.