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I cannot say to measure your bass before trying, as you do not yet have the bass, but that is exactly what you should do when you get it.
Also, I am surprised that they did not outright say not to do it, as they are generally strict in their advice against these kinds of ideas.
Bottom line is that they will not likely back you if doing it does break any of the strings.
Also, a tip about round core strings such as the LaBella LTFs :
If you straighten out the bend from where they went through the old tuners, the wrap could separate from the core, ruining the string in an invisible manner, which is a further reason not to move them from bass to bass, even if you had 2 of the same basses - so leave the bend there, or make a new bend at a shorter location [if necessary at all], before re-cutting the string.
One vendor, 'Strings and Beyond', actually included a paper with them when I ordered some, cautioning us to make the bend before cutting the string to length, for the same reason.
BTW, I had ordered regular short [32.25"] scale LTFs for my Hofner Ignition Club bass, which is another bass for which they are not recommended.
However, by measuring before I ordered, I determined that they would fit.
Other Hofner bass owners have since posted measurements suggesting that depending upon the length of the tailpiece, on some productions of Hofner basses, regular short scale Labella strings may NOT always fit.
Just another tidbit for those who are taking chances with alternate spec strings....

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