upgrading inductor

Same person asking about crossover changes?

Iron inductors are OK up until saturation.

Please consult an online inductor calculator. some are pretty good. I'll post one later......

Yes is the answer to your question. You will need MORE of the lower resistance larger wire for the same DCR. Iron core original inductor complicates things, but I was able to design a match for my Magnepan's inductor using aircore formulas and calculators.
Start running some simulations using the calculator I ref'd above.

http://www.diyaudioandvideo.com/Calculator/Inductor/

PM me and I can help. This is pretty basic.

Kij,
The OP has left the building.

It's all about tradeoffs and the original inductor.

If the original inductor is aircore, and larger gauge wire, don't bother.

IF the original inductor is iron core 16 or 18 ga in a fairly low sensitivity speaker, like my Magnepans, than you can get some headroom out of going to larger gauge wire as long as you consider the DCR of the new piece. Changing the DCR will alter the crossover point...but usually not much AND change driver balance and perhaps voicing. 1db would be a large change in my panels.

Inductors in mids and tweets? much less important than in the bass where most of the power goes. That is the best use of a new inductor...in the bass. And than only if you are a 'power user' and routinely crank it up.

Inductor calculators? yep...and plenty on line. Run some 'simulations' My design for my panels new inductor? 14ga......up from 16, aircore and with a DCR within 5% of the original unit. It is also the same number of layers as winds, so the coil is square in cross section AND I designed it to be wound on a standard size of PVC pipe, right from the home store. Outside diameter is a tick over 4" and less than 1" thick, so it is a manageable size.