won't know the difference vs won't notice the difference

Both phrases are correct, but they are used in slightly different contexts. 'Won't know the difference' is commonly used when someone is unable to distinguish between two things, while 'won't notice the difference' is used when someone is unable to perceive a change or variation.

Last updated: March 20, 2024

won't know the difference

This phrase is correct and commonly used in English.

This phrase is used when someone is unable to distinguish between two things or options.

Examples:

If you use the cheaper brand, I won't know the difference.
She won't know the difference between the two fabrics.

Alternatives:

won't be able to tell the difference
won't be able to distinguish the difference
won't be able to differentiate
won't be able to perceive the difference
won't be able to recognize the difference

won't notice the difference

This phrase is correct and commonly used in English.

This phrase is used when someone is unable to perceive a change or variation in something.

Examples:

If you change the recipe slightly, most people won't notice the difference.
I switched the paintings, but she didn't notice the difference.

Alternatives:

won't perceive the difference
won't detect the difference
won't realize the difference
won't spot the difference
won't pick up on the difference

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won't know the difference vs won't notice the difference