The two pictures are taken at different angles, it seems to me, the lower one "straight on" and the upper one a bit from the right. That said, the relations of the letters seem identical in top and bottom. Look at how, for instance, the period after the second "J" is directly above the left serif of the "U" in Boulton, and the way the two bottom serifs in the "H" sit directly above, on the one hand, the right serif of the "U" and, on the other, the serif of the "L." In both cases there's an identical, slightly larger space between the "L" and the "T," which, again, ends up lining up (in both cases) the bottom serif of the "N" in Henry directly above the right side of the "T." The bottom right edge of the "R" in the top and bottom stamp falls slightly above the straight line that the rest of the bottoms of the letters of "J. J. HENRY" form. The period after the first "J" falls, in both cases, right above the slightly distended bottom loop of the "B" in Boulton. Seems to me that, though the angles that the pictures were taken seem a bit off, the stamps are the same.
Do others see it differently?