Yes, the Catholic parishes of Kilcolman and Bekan are adjoining, at least along part of their respective boundaries. You can see how they are located in relation to one another on the map at this link (Bekan is to the east of Kilcolman, partially separated from it by the parish of Knock):
https://registers.nli.ie/parishes/1056
At that site, you can also access the parish registers for Kilcolman which are available online (1836-1873). You can use the map there to do the same for Bekan (1821-1871, with some gaps) by clicking on its name on the map.
At this link, you can see a list of the townlands in the civil parish of Kilcolman, and to further links with info (and, in each case, a map) about each townland:
https://www.townlands.ie/mayo/kilcolman2/
Keep in mind, though, that civil parishes (an older type of division which evolved into just an administrative one) often do not have the same boundaries or names as the local Catholic parish. Catholic parishes are often larger, and may include parts (or all) of several civil parishes. As you can see from comparing the two maps at those sites, in the case of Kilcolman the boundaries happen to be roughly the same, as is the parish name. The same is roughly true for the civil and Catholic parishes of Bekan, as you can see at this link showing the civil parish (though there may be some differences at places along the boundary, which is very irregular):
https://www.townlands.ie/mayo/bekan2/
Once again, there ls a list of townlands in Bekan at that link,
In a given civil parish, there is often a townland with the same name. The parish names came later, and frequently just took the name of some principal townland, Normally, if you find a place name in a parish register, it is referring to a townland, not a parish. In later civil records (like birth records, which started in 1864), the townland name is not always given, and the only place listed is sometimes the civil registration district (normally named after the largest town in the area), and those districts may cover several parishes (Catholic or civil).