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Screw holes being in a different position can be advantageous, because you get fresh plastic for the screw to go into, not a possibly stripped hole.
Even hinges that can be opened either way come as a pair. Ones that only open way come as left/right, top/bottom pair. Avocet did accidentally send me a pair of two right hand hinges in a larger order, so check before starting the work.
At 8 years old, I'd assume your windows have the glazing beads on the inside, so reasonable access to remove the beads and remove the glass... no fannying about outsidd on ladders with slings. With 3 reasonably large windows to do, I'd invest in a couple of chisels, a glazing shovel and maybe a cheap suction cup and remove the glass. That way your not holding a heavy sash and glass from the first floor. Plus it has been known for people to fit longer replacement screws or pilot drill too far and catch the edge of the glass which doesn't end well.
With the glass removed, its obviously lighter and so much easier to hold onto.
https://www.windowrepairshop.co.uk/epages/es115683.sf/en_GB/?ObjectPath=/Shops/es115683_shop/Products/C139
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user69121
Thanks for that info. I will look at the Phocas hinges to check if there are any problems with the position of the screw holes. I am a bit worried about handling the weight of the window while fixing the last screws. I am thinking of rigging a sling from a ladder outside the window. It is a bit tricky as the one in the photo is above the porch roof and one of the others is above a big bay window.
This might be a silly question - do they come in matching pairs when you buy them or do I have to order top/bottom or left/right ones?
I found this naff video https://m.youtube.com/watch?v=LKQ4NpViQJ where the Handyman cuts out the scenes where he almost drops the window outside.