ok,
I will close the topic and yes to have interoperability PVSTP and Juniper, as in my case, is needed to configure in juniper side the rstp and vstp as per
https://forums.juniper.net/t5/IOS-to-Junos-I2J-Tips/VSTP-PVST-Spanning-Tree/td-p/136123
https://kb.juniper.net/InfoCenter/index?page=content&id=KB18291