Paucal is frequently not very strict, and in a number of languages with a paucal form, many different absolute quantities may be referred to sometimes with the paucal, sometimes with the plural.
Greville G. Corbett in Number, a volume in the Cambridge Textbooks in Linguistics series, writes:
Schütz (1985: 251) also discusses the paucal in Fijian, and says that
it can be used for three and for twelve. Some consultants put the
limit at fifteen, others put it higher. He points out that contrast is
more important than the specific number, and mentions a text in which
approximately thirty people are referred to sometimes with the paucal
and sometimes with the plural. Andrew Pawley (personal communication)
also says that its range varies considerably according to the
Even if this quote does not specifically answer your question, it strongly implies that there may well be a language, where ten grains of rice may be referred to in the paucal and ten people in the plural. But by the same logic, it may well be that the same language in other contexts will use the plural for ten grains of rice and in still other contexts use the paucal for ten people.