Travelling to canada on old employer visa

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Hi All,

I am planning to travel Canada on previous stamped H1b visa and wants to come back on same visa. I have new H1B I797 approved petition with new Employer till April 2020. My stamped Visa date is July 2020. I am have Canada visitor visa.
So can i travel to Canada on old employer stamped visa?

Thanks and Regards,
Amandeep