"light blue" equivalents?

As @keavdog says, for Gunze, it's C117 (H417 is not as close, if you're looking at the aqueous).  I believe MRP-046 is the closest for that line.

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From this site: https://www.modelshade.com/paint-conversion-chart/vallejo-modelair/71.306

Mr. Color C117

I'm sure MRP has something, but I guess it would be more of a question of what you're painting this color.  MRP often has their paints named for the country, era, and aircraft that the color is meant to replicate.

Can't help with your question...but the current rendition of your header shows the drawback of using quotation marks in the title with this forum's wonky software.

If it bothers you, it corrects easily enough, but it will go pear-shaped again (only) if you happen to edit the initial post.

Cheers