If it runs from Pune in morning as per the info provided above the dep and run with overlap with Mumbai VB at 1500 from AHMD upto Vasai road nearly 440 km.

With Jamnagar AHMd being proposed to be extended Surat they will be too many premium trains in between Surat and AHMD in mid day which travelers will not prefer to travel in that section as they need morning and evening dep before and after business and working hours. Mumbai AhMD Vande Bharat though has WL at Mumbai everyday have 250...
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vacant seats between Vadodara and AHMD and Shatabdi may have more as it's runs later.

See the route has immense potential .. as this is the route where bullet trains are proposed. which will run at an interval of 15 mins to 1 hour.

now. if VB runs from Pune in the morning , it will certainly ply on Vasai - ADI section atleast 2 hours after the GNC VB.
and in return , it will have leave...
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ADI by 1430 hours to reach Pune in time .. i am expecting an 8 hour run atleast.

so in such case both the VBs can be adjusted. and they won't cannibalize each other as we can anticipate that end to end passengers (ADI/ST/BRC-Pune region) would fill this train to the brim. there is a huge gap and demand on this sector...