How to Match Crochet Hook Size and Yarn Weight

I'm trying to crochet amurgumi toy. The pattern calls for an 4.0 hook However, the yarn says an I hook. Is ok to use the 4.0? Why does yarn say one thing

Crochet Hooks, Guide to Types and Sizes, Yarn Needle For Crocheting

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Same weight yarn is a different size?! I had to buy a different brand of yarn because I needed this color and when I stitched the squares together I noticed they are

Crochet Hooks, Guide to Types and Sizes, Yarn Needle For Crocheting

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How to Match Crochet Hook Size and Yarn Weight

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Tulip CarryT Interchangeable Bamboo Tunisian Crochet Hook : Size H-8 (5.00mm)

What Can I Make with G and H Crochet Hook Sizes

10 Pack Size H / 5mm Crochet Hooks for Beginner or Expert Crocheters, 5 mm Crochet Hook Great for Group Crocheting Like Classes, Clubs, Family (Blue

Hooks Momo's Knitting Nook