Answer: No. The iPhone 14 Pro Max case will not fit the iPhone 15 Pro Max.

iPhone 15 Pro Max Dimensions:
Height: 160.8 mm
Width: 78.1 mm
Depth: 7.4 mm

iPhone 14 Pro Max Dimensions:
Height: 160.7 mm
Width: 77.6 mm
Depth: 7.85 mm

Although the iPhone 14 Pro Max and iPhone 15 Pro Max look very similar, and both have 6.7-inch displays, the iPhone 15 Pro Max is 0.1mm higher than the iPhone 14 Pro Max, the width is increased by 0.5mm, the depth is reduced by 0.35mm.

In addition, the iPhone 15 Pro Max also adds a new camera, making the lens and overall camera area larger. So your 14 Pro Max case would conflict with the 15 Pro Max’s camera bump.

So the old iPhone 14 Pro Max case will not fit the iPhone 15 Pro Max. It would be much better to buy a new case. Because this is a new model, no old phone case will fit the new model perfectly.

What about the other direction: can you make the case for the newer iPhone 15 Pro Max fit the older iPhone 14 Pro Max?

The answer is possible, depending on who made your iPhone 15 Pro Max case, if it’s a case from a third-party accessory manufacturer, it might match; if it’s an Apple-made case, it might not match perfectly.

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