First, don't use eRGB! You ideally want to embed sRGB for web use although if anyone's browser isn't color managed (few but they still exist) or a site strips the profiles, you'll find a visual mismatch with Photoshop which is color-managed.
The iPad and its browser are color managed and should match Photoshop pretty well depending on the calibration of each system's displays. iPads are calibrated at the factory but one does have control over brightness and do turn off Night Mode!
Author “Color Management for Photographers" & "Photoshop CC Color Management/pluralsight"
iPad [and iPhone] factory calibration is pretty reliable so inter screen matching is very good, of course brightness is very adjustable so needs to be set correctly .
IF your main compter screen is correctly calibrated and profiled and if you save images with sRGB embedded they should reproduce well on. the iOS device. My iPhone X matches my Eizo Coloredge screen very well.
With all set up correctly on your computer, these should match well
I hope this helps neil barstow, colourmanagement net :: adobe forum volunteer:: co-author: 'getting colour right' google me "neil barstow colourmanagement" for lots of free articles on colour management