is the ipad mini a17 pro compatible with my current apple pencil 2nd gen?

No.

The new iPad mini Supports:

• Apple Pencil Pro
• Apple Pencil (USB‑C)

iPad mini - Technical Specifications - Apple

WilsonIp wrote:

So, a third party accessories can but not Apple pencil gen 2?

Logitech Crayon for iPad - Apple (HK)

Probably because it's built differently that the Apple Pencil. Again, Apple does not disclose why it's not compatible, just that it isn't.

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click here ➜ Feedback - iPad - Apple

Unknown. no reason given, but Apple specifically points out its compatible with the above pencils and not the Second Generation Apple Pencil for whatever reason.

So, a third party accessories can but not Apple pencil gen 2?

Logitech Crayon for iPad - Apple (HK)