Yes, there is. The original 29/70 frame was a one-on-one copy of the Swiss 06/29 lay-out. Mauser overlooked the fact that the Swiss had played with the opening curve, tuning it to their standard barrel length and .30 luger army ammunition.
Mauser needed to produce different barrel lengths in different calibers, causing functional problems. They did some comparative tests with Mauser and DWM p08 pistols, and found that the Swiss had altered the curve which caused the toggle to break at a different moment.
They discovered this when the first 1000 or so frames were already being produced. The decision was made to reserve those frames for the .30 luger version and to mark the remainder with a heart shaped symbol just below the safety lever, so that they would not be used in other variations.
The top comparison was used to identify the differences between a pre-series Mauser Parabellum (bottom) and a 29/70 - 06/73 transitional pistol. So the other differences can be disregarded. The difference marked with the arrow is the one we are discussing here.
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