If you are willing to bet on model similarity then as per this the dell U2419HC should have an avg Delta E value of less than 2(lower the value better is the colour calibration)There is something called as Industry Standard Colour Calibration ? Acceptance ? A Day is Day for everyone and Night is Night for everyone. You cannot say a Day is what one perceives and could be night for other person
Reviews on amazon suggests that LG 24MP88HV comes with factory colour calibration(to achieve this at home you will need a hardware colour calibration device like datacolor spyder) so again both are kind of similar unless you can find the avg Delta E value of LG 24MP88. Two monitors having similar Delta E value should produce similar colours.