Comparison

Gibraltar vs Thunderstorm

Sherwin-Williams SW 6257 and Vista Paint 0514, ΔE 2.46 apart

Sherwin-Williams Gibraltar SW 6257 on a wall, hex #626970
Gibraltar Sherwin-Williams SW 6257
Vista Paint Thunderstorm 0514 on a wall, hex #5D636B
Thunderstorm Vista Paint 0514
Zeytin’s verdict · ΔE 2.46Close cousins. Paint a sample of each before you choose.

Sherwin-Williams Gibraltar (SW 6257) and Vista Paint Thunderstorm (0514) measure a delta-E of 2.46 apart. They sit within 0.8 LRV points of each other, so neither will look brighter than the other on the same wall. Both carry a similar amount of color, at chroma 5 and 5.3. Close, but a large sample of each will show the gap, particularly against white trim. If you need the Thunderstorm depth in Sherwin-Williams's line, start from its LRV of 13.0 rather than matching by name.

Is Sherwin-Williams Gibraltar the same color as Vista Paint Thunderstorm?

Not quite, but close - Sherwin-Williams Gibraltar and Vista Paint Thunderstorm are delta-E 2.46 apart, close enough that most rooms would not show the difference.

What is the delta-E between Sherwin-Williams Gibraltar and Vista Paint Thunderstorm?

The measured color distance between Sherwin-Williams Gibraltar and Vista Paint Thunderstorm is delta-E 2.46.

CLOSEST PAIRΔE 2.46 Gibraltar and Thunderstorm
LIGHTESTGibraltar LRV 13.8
DARKESTThunderstorm LRV 13.0
SPREAD0.8LRV points

Side by side

measured values
Gibraltar Thunderstorm
Brand Sherwin-Williams Vista Paint
Code SW 6257 0514
Hex #626970 #5D636B
Light reflectance 13.8 13.0
Undertone blue cast blue cast
Chroma 5.0 5.3
Hue angle 257.1° 264.5°
Color family gray gray

Each on its own

full detail