just for fun, i weighed a STEEL chain ring, 50 tooth, 110 BCD... 228 grams, and it's a fairly light one...

weighed an aluminum chain ring, 52 tooth, 110 bcd... 69 grams.

your weight savings if you swap out both chain rings? in the neighborhood of 1/2 lb. of ROTATING MASS, that must be accelerated EVERY TIME YOU PEDAL YOUR BIKE...

get the lighter chain rings....

and look into getting lighter pedals, wheels, and tires when you are able... rotating mass, you know... you will be glad you did.... unless you like working harder than you need to.

upgrading to a hollowtech II crank set will shed even more weight from your bike, btw... up to a POUND or more... the steel bottom bracket assemblies are HEAVY... Hollowtech II uses a hollow aluminum spindle, and aluminum cups... light, inexpensive, and easy to replace when worn.... no special puller needed, just the HT II type wrench.... the shimano chain rings are of high quality, and will last quite a while if you keep your chain cleaned, and use decent chain lube regularly.

as to crank ARMS... if your crank set has aluminum arms already, the weight savings will be minimal when swapping to another aluminum armed crank set with steel chain rings... MOST of the weight is in the steel RINGS.