The 7453 appears to be the current one sold in a box and the 7701 comes in a bag but seems available online still.
Are there differences? Thanks.
7453
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(http://ecx.images-amazon.com/images/I/81iYDeNQRVL._SL1500_.jpg)
.
.
7701
.
(http://ecx.images-amazon.com/images/I/41NK54MDJ3L.jpg)
Ah, so just cosmetic, with the red kettle now.
Maybe the white one is older and a collectible! ;)