Your Merckx is a design offshoot of DeRosa. Of similar construction styles too, at least in the lugged frame period.
For something different- a Primato with EL-OS by Columbus another would be a Masi Volumetrica, both having oversized tubing, not exactly the same but will ride a bit different than a standard sized tube set.
otherwise it is geometry that holds the key. Gios was an early adopter of short top tubes, more weight on the front axle as you generally needed a log stem to get a similar position. They kind of jumped to aluminum instead of doing much with oversized tubes in steel.
Colnago set his own course, I have bikes from the mid 70’s from him and 1968. Two different eras handling wise. The later bikes that only slightly differed from bikes in the 80’s are very entertaining but not the first choice for an all day in the saddle effort.