List comprehension iterating over two lists is not working as expected

Your first list comprehension is equivalent to:

res = []
for ver in version:
    for link in useragents:
        if ver > 60:
            res.append(link)

Notice you have nested loop with time complexity O(n²), i.e. you are iterating over every combination of version and useragents. That's not what you want, assuming your version and useragents lists are aligned.

The equivalent of your for loop is the following list comprehension:

res = [link for link, ver in zip(useragents, version) if ver > 60]

This

[link for ver in version for link in useragents if ver > 60]

is not the same as zip. It's not iterating through the two sequences in parallel. It's iterating through all combinations of those two sequences.

It is as if you wrote:

for ver in version:
    for link in useragents:
        if ver > 60:
            # append(link)

So if both sequences had length 5, there would be 25 combinations (some of which are filtered out by the condition ver > 60).

When you want to go through sequences in parallel, zip is the way to do it, even in a comprehension.

[link for (link, ver) in zip(useragents, version) if ver > 60]

Alternatively you can use the function compress() in combination with map(), where you check some condition:

from itertools import compress

filter_ = map(lambda x: x > 60, version)
list(compress(useragents, filter_))

Example:

s = 'ABCDEFG'
nums = range(len(s))
    
filter_ = map(lambda x: x > 3, nums)
print(list(compress(s, filter_)))
# ['E', 'F', 'G']

[link for (link, ver) in zip(useragents, version) if ver > 60]

You still have to zip the two lists together.