The phrase "though different" is correct and can be used in written English.
It typically is used as a transition word between two ideas. For example, you could say "The two approaches are similar, though different."
Even though different scanners differ slightly, it is generally accepted that a RATIO value above 1.5 is clearly abnormal.
Though different weights were lifted, significant differences were not found in the range of motions ROMs).
Though different sediments had slightly different patterns in winter, there were no obvious differences between the different types of sediments.
Though different for how long?
They are of similar scope though different in detail.
For others, though, different strains have very different flavours.
The challenge was to do something as good, though different.
Though different from each other they have strangely similar properties.
The perils for ordinary, uncontroversial people, though different, remain real.
Pretty quickly, though, different churches, probably Paul's churches, initially, started sending around copies of Paul's letters.
His judgment, though different, is likewise traditional: portents of Nature outraged.
