It don't matter. Long as the pistons aren't top dead center. An open valve could interfere a top dead centered piston and cause serious damage while installing the heads.
If the engine has overhead cams then yes if standard cam engine then no
you neesd special tools to reset timing, they need to be installed before the belt is removed and a new one is installed - update to above answer - If you look on the right side of the cams (the side that doesn't have the timing belt on it) you will see at the end of the cams there are slots. When you have the crankshaft turned to TDC and you are on the compression cycle you will see the slots on the cams should line up. If you can get a piece of metal (that's the shape of a ruler) that's 5mm thick, you can slide it into the cam slots to line can cams up for compression TDC. If the cam slots line up, but are below the engine head, you are in the exhaust cycle and need to rotate the camshaft 360 degrees to get to the compression cycle. The cam slots should then be above the engine head so you can fit the metal 5mm alignment tool. Changing the timing belt is not fun doing it the first time. It's a pain and there's a good chance you won't get the timing right.
if the are both single over head cams or if they are both dual over head cams they will fit
double over-head cams
do you mean the cylinder head or the timing gears that mount on the cams .
2 cams per cylinder head ( so 4 in total for the DOHC engine )
The 2.0L engine in all zx2's(98-03) are NON-interference engines unless the head has been milled and/or aftermarket cams have been installed...
one
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no as there are head bolts directly under the cam i belive
2 ( 1 camshaft for each cylinder head )
as long as the timing has been disconnected and cams removed you should only need to rap the side of the head with a rubber mallet to break it free. Do not use a metal hammer.
2.2 OHV (Over Head Valves) & 2.4 DOHC (Duel Over Head Cams) They are not interchangeable