How does the rhyme scheme in first two quatrains differ from last two quatrains in" The Garden Of Love"?

The question seems to suggest that "The Garden of Love" by William Blake is a four stanza poem. The poem is a three stanza poem, and each stanza is a quatrain. The question does ask how the rhyme scheme of the first two stanzas is different than the following stanza, and that is an accurate question. The first two quatrains have an ABCB rhyme scheme. This means that the ends of lines 2 and 4 rhyme with each other. The second stanza follows this same pattern if taken by itself. If a reader compares stanza 2 to stanza 1, then line 3 of the second stanza rhymes with line 1 of the first stanza. The final stanza drops the rhyming completely. It is an ABCD quatrain in terms of rhyme scheme when looking at the ends of the lines. The final two lines of the poem contain internal rhymes. Blake rhymes "gowns" with "rounds" and "briars" with "desires."
https://www.poetryfoundation.org/poems/45950/the-garden-of-love