As a general comment, steel beam sizes are nominal (this is a 7x4 in old money) and the actual size of the section may be a bit different. Where the same section comes in more than one rolling weight, e.g. 203x133x25 and 203x133x30 the widths and heights will be different; the distance between the inner faces of the flanges stays the same
As said, this is a Euronorm IPE180O section, about 10% heavier and stronger than what you asked for, so nothing to worry about.
Perhaps the next thing is Indian Standard Sections!
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