An excerpt from Srila Bhaktivinode Thakur's Sri Caitanya-siksamrta:
"People in various countries on various continents have a wide variety of natures. Although their principal nature is only one, their secondary characteristics are many- you will not find any two people in the world who have identical secondary qualities. Since even twins born of the same womb have some difference in form and quality, can one expect that people born in different countries can ever have exactly the same qualities?
Different countries have different water, air, mountains, forests, and different eatables and clothing. Because of this, the people of these places have naturally developed different physiques, complexions, customs, clothing and food. Similarly, people's mentalities differ.
Thus, various people's ideas of God though basically similar, will differ in secondary details...
Considered objectively, there is no harm in secondary differences. If there is agreement concerning the essential nature of God and His worship, there should be no obstacle in attaining the same result. Thus Mahaprabhu has taught that we should instruct everyone to worship the pure form of the Lord, but at the same time we should not criticize others' mode of worship."