[R-sig-Geo] Did I correctly convert my data from UTM zone 12 to 11?

[Jason Edelkind via R-sig-Geo]

hello, first time user here and aspiring grad student. I have a set of 
location data that I’ve been trying to import into google earth engine from R 
as a CSV file. The problem is that about half of my data is from utm zone 12, 
and the other half is from utm zone 11. When I import my original data into 
google earth engine, the zone 11 data is shifted over to the right because I 
use utm zone 12 as the crs in R. After some reading into the definition of a 
utm zone, I tried to just subtract 6 from the zone 11 latitude values after 
first converting them to a lon/lat format. This appears to have worked as on 
first glance all of the zone 11 points are where they should be, however it 
feels like too easy a fix for me after struggling with this for several days. 
So my question is, is this an acceptable way to convert my data, or am I doing 
something wrong that could result in inaccurate location data? Thanks!
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