No. Samvatsari and Ganesh Chaturthi are not the same day in the usual Jain calendar.

• Ganesh Chaturthi is on Bhadrapada Shukla Chaturthi.
• Samvatsari is generally observed on Bhadrapada Krishna Chaturthi in the Shwetambar Jain tradition.

So they are usually different tithis and fall about two weeks apart.

If you want, I can also explain the Jain date for Samvatsari in a simple calendar format.