Their 47mm AT gun might have better chance at that than the HE only howitzer ...
Although the 75mm SA35 mainly shot HE (OE Mle.1915), an APHE, the OR Mle.1910M (V°470m/s - Penetration 35mm/30° at 400m) was also used.
Correction, the previous values I presented were assuming APCR ammunition. The typical armor piercing capped round will penetrate a maximum of 39-mm at 100 meters, and this drops as the range gets greater. It still probably could from the sides, but the front is pretty much out of the question.
No APCR was developed for the 47mm SA35 (or at least no French made), the gun using APC (OR Mle.1935 - V°680m/s - Penetration 35mm/30° at 400m) and HE (OE Mle.1932)
Numbers coming from Stephane Ferrard.
But yes, the front of a Sherman, no matter the variant, would be immune to both the 75mm and 47mm of a B1 Bis, the side however would be at risk, especially at lower ranges.
As a sidenote, Brandt was developing in 1940 subcalibrated shells for the 25mm Mle.1934 and derivatives (37/25mm V°1150m/s, needing a reboring of the barrel to be shot), 37mm Mle.1916 and derivatives (37/25mm V°850m/s, same as for the 25mm), 75mm Mle.1897 and derivatives (75/57mm V°900m/s), 155mm and 203mm (the last two being naval guns).
In June 1940, the French government allowed Brandt to cede his patents and operating licenses to the USA and the UK, where they were used to develop the APDS.
Likewise another of Brandt development, the 50mm AT rifle grenade, ended as a basis for the US M9 rifle grenade.
Not to speak of Brandt mortars, evolutions of the excellent British Stokes, which ended being copied/licensed by more or less everybody.