The pain of separation describe in a valediction of weeping differs from that described in sonnet 97

In A Valediction: Forbidden Mourning by John Donne, he tries to console his lover who is devastated upon the news of his departure for an extended time. He does so by explaining her that everything will be alright because their love is so true and binds them so tightly that it will bring him right back to her. While he acknowledges that their parting will be difficult, he is comforted by their love for one another and optimistic about his own return.

On the other hand, in Sonnet 97: How Like a Winter Hath My Absence Been by William Shakespeare, his tone is sad while he laments on the suffering and bleakness he has experienced while away from his muse. He compares the stillness of his writing by using the winter metaphor. Unlike Donne, he is not as hopeful as he doesn't sound certain of his reunion with his muse, but rather tries to find comfort in knowing that winter doesn't last forever as there are other seasons in the year.