Changing An Older GE Range From 208 to 240 Volts
Yes you only need change the elements, it looks like two top elements and the bake element have already been changed so you are probably OK there.
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GE has not sold 208 elements for this range in over 30 years so it is likely that the replaced elements are all labeled 208-240 volts which is OK for 240 volts.
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All the elements on this range are labeled, you have to look closely to see it, If it only says 208 volts those are the ones you can not use on 240 volts.
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John L.