GC mid-Mula vs. Dhruva GC mid-Mula

I noticed in Kala there is an option for GC mid-Mula as well as Dhruva GC mid-Mula, which also has equatorial and ecliptic longitude options. I believe I understand the difference; can someone tell me if I have done so properly?

1) GC mid-Mula

Divide the ecliptic into 27 equal portions such that 6:40 of Mula coincides with the ecliptic longitude of the Galactic Center

2) Dhruva GC mid-Mula

Divide the (celestial) equator into 27 equal portions such that 6:40 of Mula coincides with the equatorial longitude of the Galactic Center

2a) equatorial option

to find the nakshatra of a planet, find that planet's equatorial longitude. the nakshatra of the planet is the one that contains the planet's equatorial longitude

2b) ecliptic option

project the equatorial nakshatra boundaries onto the ecliptic. to find the nakshatra of planet, find which ecliptic-projected nakshatra contains that planet's ecliptic longitude

so GCmid-Mula divides the ecliptic equally, whereas DhruvaGCmid-Mula divides the equator equally. with 2b) the equal division of the equator creates an unequal division of of the ecliptic, so each of the Dhruva nakshatras projected on the ecliptic will not be the same size