Cams are interchangeable between the 4g61/67/63/64 heads being that they are also, all from this generation of motor.
Here is what I have found from alot of overseas threads, and local stuff from North America as well.
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Most of that information was gleaned for reputable members who had very successful builds or just a good knowledge about these heads.
Just be aware that the thread is open to interpretation and if you find any differences here, just let me know.
4g61 heads have smaller CC, same valves, smaller intake port sizes, large exhaust ports like 1G heads.
4g67 heads have smaller CC, same valves, larger intake port sizes, large exhaust ports like 1G heads.
43cc vc 47 cc. This would probably explain the difference in compression ratios between the 4g63t and 4g61t, considering the piston and deck heights leave the pistons at exactly the same height in their respective bores. If using a 4g61 head, it would stand to reason that you have to use the 4g63 head gasket option.
For anyone putting on a 4g61t head gasket kit from Fel-Pro, it is made to accomodate piston sizes up to the 4g64 sizing and IIRC, maybe an overbore. Not sure if the OEM gasket has any extra girth to accomodate an overbore. That is off topic, but when people are mixing and matching parts, it helps to know about a few hurdles depending up on their available options.