Can i use Apple Pencil Pro with six generation iPad mini?

No, your Apple Pencil is not compatible with your iPad. Your iPad supports Apple Pencil (2nd generation) and Apple Pencil with USB-C, not Apple Pencil Pro.

The compatibility guide will help you:

• Apple Pencil (1st generation): iPad Pro (2015-2017), iPad Air (2019), iPad mini (5th generation) and iPad (6th generation or later)
• Apple Pencil (2nd generation): iPad Pro (2018-2022), iPad Air (2020-2022) and iPad mini (6th generation)
• Apple Pencil with USB-C: iPad Pro (2018 or later), iPad Air (2020 or later), iPad mini (6th generation) and iPad (10th generation)
• Apple Pencil Pro: iPad Pro (2024) and iPad Air (2024) model.

No. The new Apple Pencil Pro is fundamentally only compatible with the new 2024 models of iPad Pro (M4) and iPad Air (M2).

Apple's definitive compatibility list for iPad and Apple Pencil can be found here:

Apple Pencil compatibility - Apple Support