More important is, that both paints are of the same kind (like: oil-based paint, acrylic paint, latex paint). Semi-gloss is more easily painted over then high gloss, but first better find out what the old paint layer is made of. Check with the help of alcohol - if paint comes off in any way when you rub it with a cloth of alcohol, it's latex or acrylic paint (and can be painted over with acrylics).
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yes, although with every paint job you should prepare the surface first. It is easier to put eggshell paint over satin paint finishes, but it is harder to do the opposite. To put a satin paint over an eggshell paint, you would have to sand to obtain a smooth surface first.
if they are the same such as both latex, then yes. if one is oil and the other latex then no. if you are not sure apply a universal primer first.
If you mix a flat and semi-gloss 1:1 you should end up with a paint in the eggshell range. Mix the same paints 1:3 and you should end up with a satin. Experiment with small amounts to get the desired gloss.
Yes, mix in a couple teaspoons regular talcum powder.
If they are both of the same base you can. Satin paint can be an acrylic or a latex,or an oil. Check on the can cleaning instructions for base. Jason Pollock used both in his work 'Bluepoles' which hangs in the Canberra museum I think
Yes, but remember that eggshell is already a changed color, so to speak. It's a colored white. Mix small amounts of the eggshell and other color to see your results. You may have to make several mixtures, so be sure to keep track of the amount of color you put into the eggshell so that when you get the color you want, you'll know how you got it and how to get it again.
If both cans of paint are interior, latex and the same colour, go ahead. The eggshell finish does not vary much in sheen level from one manufacturer to another. If one can is oil base and the other latex, NO. If the colour of the two cans of paint are not the same... I'd be very careful as you may not like the new colour you get.