Minecraft in 1.18 has no shadow seeds.

I entered two seeds (original and shadow) that they are supposed to have same biome layouts. Here are the seeds and screenshots of these happenings.

Seed 1 - original

Seed -7379792620528906220 - shadow seed but different biome layouts

Expected result: Both original and shadow seeds are supposed to have same biome layouts.

Observed result: Both original and shadow seeds have different biome layouts.