The name on it. Different barrel makers use different names for the same profiles or cut their profiles slightly different. Without knowing anything more than you've provided, it's impossible to make a recommendation.
For Remington factory rifles, the difference is the rate of twist in the rifling. The SPS Varmint in .223 has a 1:12 twist and is limited to the lightweight varmint bullets. The SPS Tactical has a 1:9 twist and will shoot some of the heavier bullets better suited to longer ranges.
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