Pinch clamp on polybutylene

[ux0042]

Greetings. Can I use a pinch clamp on the Polybutylene side of a Pex to Polybuylene fitting? The fitting is cold expansion pex (Uponor). I have fittings, but only have pinch clamps convenient. Although the clamp manufacturers don't state polybutylene compatible in the information I could find. Presumably, the pinch clamp exerts enough pressure relative to the fitting. I had a plumber do some work and that is what he did (photo attached). Thanks to all for any insight.