Hello Musadjan Alim,
Parts with or without EPDC are pin-to-pin compatible provided that they have the same Package Type (this is relevant on the i.MX6ULL as there are two package types).
As for availability, you may check the i.MX6ULL Buy section of the i.MX6ULL website.
https://www.nxp.com/products/processors-and-microcontrollers/arm-processors/i.mx-applications-proces...
There is an Application Note (AN5350, link below) that covers the i.MX6ULL Migration from the i.MX6UL. There is a section dedicated to the EPDC signals, but we do not have a reference design per se.
https://www.nxp.com/docs/en/application-note/AN5350.pdf
As for stock of the MCIMX6Y7CVM08AB, this part number is not listed on the Buy section. The closest is MCIMX6Y7DVM09AB. It could be that there is not an industrial part number with EPDC available as EPDs are not as prevalent on industrial applications, but you may contact your Distributor or Sales Representative to inquiry about availability.
I hope this information helps!
Regards,