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Hi Michael, yes sir, the 9EZ will fit in the same holster as the 380EZ. Stay safe & have a great day!

Hi Michael and welcome. Yes, the outer diameter of the EZ line of pistols is the same and the Holsters are cross compatible. Cheers, stay safe and enjoy!

Yes. With no problems. Seeing the specs below you'll notice they are not far off at all in size, just weight.
M&P Shield EZ 9mm (9mm) M&P Shield EZ 9mm (.380 ACP)
Caliber: 9mm .380 ACP
Capacity: 8+1 8+1
Barrel Length: 3.675 in. 3.675 in.
Overall Length: 6.8 in. 6.7 in.
Height: 5 in. 5 in.
Weight: 23.2 oz 18.5 oz
MSRP: $521 $454
Source: Smith-Wesson
As you can tell, there isn't a lot of physical difference between the two. But the EZ380 is lighter and just a hair smaller.