Are all thirteen groups turtles?

No. Dinosaurs with Glasses is seventh and Baby Dinosaurs is thirteenth.

Why do two yellow hat-and-glasses labels look similar?

Yellow Turtle & Sunglasses & Hat and Yellow Turtle & Hat & Glasses distinguish sunglasses from glasses.

Yellow Turtle & Flower Crown follows Purple Turtles & Glasses & Hats.

Bubble Match level guide

hard

Separate thirteen turtle and dinosaur groups by species, body color, eyewear, and headwear.

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Begin with Blue Turtle & Sunglasses & Beanie, Blue Turtle & Sunglasses & Hat, and the two pink turtle labels.
Continue through the two yellow turtle labels and Dinosaurs with Glasses, then return to Blue Turtle & Glasses & Hat.
Clear Purple Turtles & Glasses & Hats and the two later yellow turtle labels before Green Turtles with Sunglasses.
Finish with Baby Dinosaurs; it fills 13/13 at Move 2 before WELL DONE.

Sorting by body color alone mixes several categories.
Ignoring glasses versus sunglasses loses a required predicate.
Assuming every reptile is a turtle misclassifies Dinosaurs with Glasses and Baby Dinosaurs.

Read species, color, eyewear, and headwear together before assigning a portrait.
Do not treat glasses and sunglasses as interchangeable.
Keep flower crowns, hats, and beanies as separate headwear traits.

Board notes 5 details

Layout: Hard, Move 44, and 0/13 open with blue, pink, yellow, green, and purple turtles plus dinosaur portraits, glasses, sunglasses, hats, beanies, and flower crowns.
Goal: Clear Blue Turtle & Sunglasses & Beanie, Blue Turtle & Sunglasses & Hat, Pink Turtle & Glasses & Flower Crowns, Pink Turtle & Sunglasses & Beanie, Yellow Turtle & Sunglasses & Hat, Yellow Turtle & Glasses & Flower Crown, Dinosaurs with Glasses, Blue Turtle & Glasses & Hat, Purple Turtles & Glasses & Hats, Yellow Turtle & Flower Crown, Yellow Turtle & Hat & Glasses, Green Turtles with Sunglasses, and Baby Dinosaurs.
Opening: The early groups distinguish blue and pink turtles by sunglasses or glasses plus beanies or flower crowns.
Danger Zone: The same turtle color repeats with different eyewear and headwear, and two dinosaur labels break the apparent all-turtle pattern.
Mechanics: Most labels combine turtle color with eyewear and headwear, while Dinosaurs with Glasses and Baby Dinosaurs switch species.

Are all thirteen groups turtles?
No. Dinosaurs with Glasses is seventh and Baby Dinosaurs is thirteenth.
Why do two yellow hat-and-glasses labels look similar?
Yellow Turtle & Sunglasses & Hat and Yellow Turtle & Hat & Glasses distinguish sunglasses from glasses.
Which group follows the purple turtles?
Yellow Turtle & Flower Crown follows Purple Turtles & Glasses & Hats.