Convert Fingering pattern to Worsted

I want to know how to change hat pattern that’s made for fingering weight yarn into worsted weight. Basic info: 12-st repeat, CO 144, US2 needles, fits 20" child head. How can I convert this to be able to use worsted weight yarn instead? How much would I cast on? I’m going by needle size that is called for for each weight yarn.

https://www.ravelry.com/patterns/search#view=captioned_thumbs&craft=knitting&query=hat&availability=free&fit=child&sort=best&weight=worsted
This link is for a search on ravelry for a free child’s hat in worsted weight. You can scroll through to see if there is something similar to the one you want to knit or just pick any one to use the stitch count etc. and then work out how to substitute the design/style!?! of the hat you have in mind.
Good luck with your project :four_leaf_clover:

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Great idea tks for it!

If you have the gauge of both the fingering weight yarn and the worsted one, then we can figure out the necessary stitches mathematically for you if you don’t find a pattern similar to the one you are wanting to knit. However, such a change in the gauge may effect the look of the knitted fabric.

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Here’s hat pattern: https://www.ravelry.com/patterns/library/black-cats-beanie

Most of my worsted is for 4x4: 23R,17s on an 8US needle

Thanks so much MK for your help!