Do they come with all appropriate screws and fittings as amazon are trying to sell two different packs of screws with them?

They come with packing shims and caps for the hinge pin but no fixing screws, different doors vary and may have steel reinforcing in them so self drilling screws are the best bet about 25mm x 5mm

Can these be fitted as a replacement on a back door

That's exactly what we did. One hinge went -i bought 2 replacements as they weren't identical to the existing ones but didn't need to. It was fine with one new and one older different brand hinge.

Instructions mentions a Jig but there is no jig included, the screw size is not mentioned

No jig availabe,( apart from trade source about £70). Depebds if you are replacing identical style. I fitted some in place of butt hinges. Some of the holes lined up on the door frame,which helped but then had to use the spacers included to drill new holes on door.

Manufacturer	Avocet
Part Number	MT3DWH
Product Dimensions	8.6 x 8.5 x 0.1 cm; 370 g
Item model number	MT3D
Colour	White Door Hinge
Style	Adjustable
Finish	Powder Coated
Material	Alloy Steel
Item Package Quantity	1
Number of Pieces	1
Maximum weight capacity	33.33 Kilograms
Number Of Holes	4
Plug profile	Door Mount
Batteries included?	No
Batteries Required?	No
Item Weight	370 g

UPVC Double Glazing Door Flag Hinge Adjustable Avocet MT3D (White)

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